Yes, I get the point and thought about it as I wouldnt want others to see nothing about my set.
I don't know if it is possible or not, but would be too crazy that lfs check while loading the mpr if the my license is involved in that mpr? If yes, then it can show the F12 tab for my car and not anyone else.
If I happen to see an mpr where I'm not involved, then the mpr would look as usual, no F12 at all.
I'm not a dev. and don't know if it's possible/easy/hard/impossible to add that flag, check usernames in mpr against LFS license name and then show or /no show F12 setup name.
Sorry my english, it gets hard to explain myself when technical data comes into play